Amel 54 MasterVol alternator regulator upgrade (from Alpha Pro to Alpha Pro 2)

Sv Garulfo

Hi all, 

Has anyone gone through the exercise of upgrading the MasterVolt Alpha Pro alternator regulator from the version installed by Amel to the MasterBus compatible version (Alpha Pro 2, aka Alpha Pro MB). 

They are very similar but the newer one, being MasterBus compatible, is easier to monitor and configure.

Amel's wiring on the 54 involves a couple a relays and a mystery box that I believe is a static 12/24v converter and I'd like to gain confidence about the setup before doing the transplant. 

Attached is a badly drawn diagram of what I believe the connections are.

I'm confused about the purple wire connected to the W pole of the alternator, especially because the new version of the regulator has an extra connection point that is meant to be wired directly to that W pole.

Any tips greatly appreciated, as always.


Fair winds


Amel 54 #122
Cap d'Agde, France

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